pros/cons in compariosn with reave? i mean InfernalBlow+MeleeSplash+MeleephysicalDMG+Multistrike should do more dmg then reave

Should perhaps, but they don't :) With this build you want single target DPS with a bit of AOE (though in one or two fights you don't want any AOE). Given that, the best options are Reave or Double Strike (or HS which has it's own pros/cons).

Using those 4 gems you mention would yield about 51% less DPS than the 4 I'm using, and you would have to deal with reflect issues, but your AOE range would be better and you would have melee corpse explosion (which can be good for even more AOE damage and bad for even more reflect).

IGN: Mortezzah, prolly playing on character Gellig
http://www.pathofexile.com/forum/view-thread/781590, for an end-game boss tank guide.

I mean the BLind alone will help you scale with the defensive stats. I see you loosing a lot of HP but may be worth it due to the possibilities of BoR passvies?

+ED charge when you block which is huge due to max block
+ 15% more block : you can then focus less on shield block nodes and putting them into HP nodes?

I used BoR to level, but losing that many HP hurts the tankiness (still doable, just not quite as tanky). I never found Blind that useful when levelling (I actually prefer to have NPCs hit on me :)). In my case you would also lose chaos res (nice for blood rage), int (nice for max enfeeble), etc. But, if you don't have a Legacy Kaoms, then it would be worth tweaking things a bit and use it (depending on your gear).

IGN: Mortezzah, prolly playing on character Gellig
http://www.pathofexile.com/forum/view-thread/781590, for an end-game boss tank guide.